Does Rihanna Want To Hook Up With Christina Aguilera?

Rihanna has made a habit out of letting her Twitter followers in on her personal life first.

Everything from the tattoos to the announcement of her new album.

Now she might be hinting towards her newest collaboration.

Rihanna had hinted that 'Birthday Cake' could be the next single, and that she might feature 'The Voice' star, Christina Aguilera on it.